XML 139 R112.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Provisions - Additional Information (Detail) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Provisions [line items] |  |  |
Current year provisions |  | $ 58.0 | $ 26.9
Lease exit liability [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Current year provisions | $ 12.8 |  |
Bottom of range [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Cash outflows for existing provisions expected period |  | 1 year |
Top of range [member] |  |  |
Disclosure of Provisions [line items] |  |  |
Cash outflows for existing provisions expected period |  | 5 years |

X
- Definition The amount of additional other provisions made. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_b&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_AdditionalProvisionsOtherProvisions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The description of the expected timing of outflows of economic benefits related to other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 85 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_85_a&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_DescriptionOfExpectedTimingOfOutflowsOtherProvisions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of provisions line items. + References No definition available. + Details
Name: | stn_DisclosureOfProvisionsLineItems
Namespace Prefix: | stn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=stn_LeaseExitLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |